Haunter doesn't evolve into Gengar by leveling it up. You have to trade it with another player for it to evolve. A good way to do it is to level your Haunter up until it learns the moves you want it to know, then trade it to a friend and then ask your friend to trade it back. Voila!
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Haunter does NOT evolve by level. You evolve Haunter by trading it with a friend, and then they trade it back to you. Hope I helped :)Haunter evolves from Gastly at level 25.Haunter evolves into Gengar through trade.Haunter evolves into Gengar by trading it.
Gastly evolves to Haunter at level 25. Then, Haunter evolves into Gengar by being traded.
Ghastly evolves into Haunter at level 25, and Haunter evolves into Gengar when traded.
Gastly evolves to Haunter at lv25. And Haunter evolves to Gengar after trading.
Haunter evolves into Gengar when traded. But unlike the tv series, you don't need to train it. It evolves right away.